In modern smart cities, public transportation is essential for urban mobility, utilizing uniform ticketing systems across various routes. However, current transport infrastructure faces critical challenges, including cyberattack vulnerabilities, long processing times, high energy consumption, and operational costs. This paper proposes a blockchain-enabled digital twin framework for secure authentication and enhanced usability in intelligent transport systems within Oslo Smart City. The Digital Twin Blockchain Secure Access Control (DTBC-SAC) framework integrates advanced techniques for data collection, secure authentication, blockchain-enabled security, and digital twin simulations. It aims to enhance public transport infrastructure by reducing processing time, energy consumption, and operational costs while ensuring robust cyber protection for passengers. Additionally, the framework optimizes edge cloud servers that support transport operations, surpassing existing infrastructure in efficiency and security. Simulation results show that DTBC-SAC effectively minimizes processing time, energy usage, and operational costs while mitigating cyber threats. These findings highlight its superior performance over current methods, positioning DTBC-SAC as a transformative solution for intelligent transport systems in smart cities.